A fake IW371762 fails one of three checks almost every time: the subdial spacing on the dial, the finish and engraving on the movement, and the reference and serial stamping between the lugs. Authentic watches in this reference block run the in-house calibre 89361, a flyback chronograph with a column wheel, and no aftermarket movement copies its architecture cleanly. Buyers who compare those three areas before money changes hands catch most counterfeits in under a minute.
What is the IW371762 reference?
IW371762 belongs to the Portugieser Chronograph Classic family, a 42 mm case line with a two-register dial and a flyback chronograph function. The IW3717 block uses calibre 89361, an in-house automatic movement with roughly 68 hours of power reserve. Genuine examples pair applied numerals, a railway-style minute track, and a sapphire caseback that displays the movement.
How do you spot a fake IW371762?
Start with the dial, because the dial is the hardest element for a counterfeiter to hide. On a genuine IW371762 the chronograph registers and the printed track sit in exact geometric relation, and the date aperture lines up with the 3 o'clock axis. Fakes use modular movements that force the registers inward, so the gap between the subdials looks wide and the date crowds the flange.
Movement and caseback
Look through the sapphire caseback. Calibre 89361 shows Geneva stripes, a skeletonized rotor with the IWC logo, and consistently blued screws, while replicas show stamped plates, a plain rotor, and mismatched screw colors. The flyback function is the decisive test, because on a genuine watch one press of the lower pusher resets and restarts the chronograph without stopping it first.
Case, lugs and engraving
Genuine cases carry crisp brushing on the flanks and bright polishing on the bezel and lug bevels, with a hard line where the two finishes meet. The reference number and case serial sit between the lugs, stamped deep and clean. Counterfeit stampings look shallow, uneven, or laser-etched rather than pressed into the metal.
Dial text and hands
The IWC and Schaffhausen printing on a real dial is razor sharp under a loupe, with even letter spacing and no ink bleed. Replica dials show fuzzy text, thick markers, and hands with rough edges where the polish stops short of the tip. Anti-reflective coating on a genuine crystal also kills reflections from most angles, something cheap copies rarely match.
Papers, box and price signals
A genuine IW371762 arrives with a reference-matched warranty card, its original box, and a booklet, and the card serial ties to the case serial. A price far below the market range for the reference is the loudest warning sign of all. If a seller refuses a caseback photo or a movement video, walk away.
What does a fake IW371762 cost?
Counterfeit IW371762 watches sell in tiers, roughly 150 to 400 US dollars for low-grade quartz or basic automatic builds and 500 to 1,200 for higher-grade replicas with decorated clone movements. Even the best replica cannot reproduce the flyback mechanism, the branded rotor engraving, or the service record of a real IWC. Anyone shopping the replica market should know exactly which tells they are accepting.
Authentication checklist for the IW371762
- Verify subdial spacing and date alignment against reference photos.
- Confirm the movement is calibre 89361 with a flyback function and branded rotor.
- Test the flyback: one pusher press restarts the chronograph without a stop.
- Inspect lug stampings for deep, pressed engraving that matches the papers.
- Check dial printing and hand finishing under magnification.
- Match the warranty card serial to the case serial.
Frequently asked questions
Is the IW371762 still in production?
IWC rotates references in the Portugieser line, so availability depends on the year and dial variant. Pre-owned examples dominate the secondary market today.
Does a fake IW371762 keep accurate time?
Some high-grade replicas run within a few seconds per day when new, but parts wear faster and service options are limited. Long-term reliability stays well behind a serviced genuine movement.